Highland Railway Cumming 4-4-0 Class

4 ft 8+1⁄2 in (1,435 mm)Leading dia.3 ft 3 in (0.991 m)Driver dia.6 ft 3 in (1.905 m)Loco weight54 long tons 19+1⁄2 cwt (125,400 lb or 56.9 t)Fuel typeCoalBoiler4 ft 8+9⁄16 in (1.44 m) diameterBoiler pressure175 psi (1.21 MPa)Heating surface1,140 sq ft (106 m²)Superheater:
​ • TypeRobinson • Heating area180 sq ft (17 m²)CylindersTwo, outsideCylinder size20 in × 26 in (508 mm × 660 mm)Valve gearWalschaertsValve typeInside admission piston valvesTrain brakesVacuum

Performance figures
Tractive effort	20,627 lbf (91.8 kN)

Career
Operators	HR, LMS
Power class	LMS: 3P
Numbers	HR: 73–74, LMS: 14522–14523
Withdrawn	1935–1936
Disposition	Both scrapped

The Highland Railway Cumming 4-4-0 class was a pair of 4-4-0 steam locomotives designed by Christopher Cumming, the Locomotive Superintendent of the Highland Railway

Dimensions

They had 20-by-26-inch (510 mm × 660 mm) outside cylinders with Walschaerts valve gear, 6 ft 3 in (1.905 m) driving wheels and a boiler pressed to 175 lbf/in² (1.21 MPa). Weight was a half-hundredweight short of 56 long tons (125,400 lb or 56.9 t).

Numbering

Table of engines

HR No.	Name	LMS No.	Withdrawn	Notes
73	Snaigow	14522	April 1936
74	Durn	14523	April 1935

Transfer to LMS

Both survived into London, Midland and Scottish Railway ownership in 1923, but neither lasted until nationalisation, as both were withdrawn and scrapped as non-standard engines in the mid-1930s. The LMS had classed them as 3P.

References

• Baxter, Bertram (1984). Baxter, David (ed.). British Locomotive Catalogue 1825–1923, Volume 4: Scottish and remaining English Companies in the LMS Group. Ashbourne, Derbyshire: Moorland Publishing Company.
• Casserley, H. C. & Johnston, Stuart W. (1974) [1966]. Locomotives at the Grouping 3: London, Midland and Scottish Railway. Shepperton, Surrey: Ian Allan. p. 146. ISBN 0-7110-0554-0.